Fluid lift pump



Dec. 13, 1938. w. c. DoYLE FLUID LIFT PUMP Filed Jag. s. 193e INVENTOR ATTORNEYS Cil Patented Dec. 13,' 193,8 y

UNITED STATES PATENT OFFICE 2,143,419 FLUID LIFT `PUMP William C. Doyle, Vernon, Tex.

Application January 3, 1938,4 Serial No. 183,181

a emma. (ci. ros- 240) This invention relates to a fiuidliit plunp and has for an object to provide a novel compressed air valve mechanism for controlling admission of air under high pressure to the oil pipe to continuously elevate the oil. L

A further object is to provide apparatus of this `character which will be formed of a fewstrong simple and durable parts, and which will not easily get out of order. 7

With the above and other objects in view the invention consists of certain novel details of construction and combinations of parts hereinafter fully described and claimed, it being understood that various modiiications may be resorted tov within the scope o! the appended claims without departing'from the spirit or sacriilcing any of the advantages oi.' the invention.

In the accompanying drawing forming part oir this specication,

Figure 1 is a verticalsectional view through a portion of an oil well casing and showing uid pressure lift apparatus constructed in accordance with the invention. i

Figure 2 is a vertical sectional view drawn to enlarged scale, showing the high pressure air valve.

Figure 3 is a plan view of the air valve trip disc.

Figure 4 is a detail perspective view, with a portion broken away, showing a modified form of seat and guide for the air valve.

Referring now to the drawing in which like characters of reference designate similar parts in the various. views, I designates a casing which is interiorly threaded at the top and at the bottom as shown at II to receive the oil `pipe I2 in the conventional oil well casing 9. The casing is provided interiorly with a .short barrel I3 in which a piston I4 is mounted toslide, the piston being threaded on to a fluid' or voil ow pipe I5. The piston is preferably formedof a plurality of sections each equipped with a rubber cup ring I3 for forming a tight seal with the wall of the barrel.

A pair of plates I1 and I8 are arranged in the casing I0, the lower plate I8 being fixed stationary in the casing and the upper plate being stationary on the. oil flow pipe I and moving. as a. unit with the' latter' toward and away from theL stationary plate` `The upper plate I1 is provided with depending pins I9 which slidably tit in openings in the lower plate.. Helical springs 2i are seated on the pins and the pins tend to hold the upper plate I1 against the barrel and prevent too high movement of the oil now pipe I5.

The, oil ilow pipe is equipped with a trip disc 22 which is of smaller diameter than the diameter oi' the cylinder lili and is provided with openings 22' as shown in Figure 3, so that air pressure may escape around the edge and through the openings of the disc as will be later described.

An. air chamber 23 is formed in the barrel I3 and has communication through a port 24 with an outlet pipe 25 extending from a compressed air pipe 25. v

A cylindrical valve casing 21 is mounted in the upper end of the air chamber and is screw threadedly engaged with the wall of the air chamber as shown at 28. A cylindrical valve seat 29 is screw threadedly engaged in the valvel casing as shown at 30 and is provided at the lower end' with a conical seat 3|.

A valve 32 is positioned to move upwardly into closed position against the seat 3i and is provided with a stem 33 which is slidably mounted in' guides 3l carried by the cylindrical wall of the valve seat 28. A helical spring 35 bears with its upper end against the valve and is supported at its lower end upon a cage 35. A ball check valve 31 is disposed in the bottom of the valve casing 21 and closes downwardly to prevent oil entering the air pipe 25 when the pressure in the oilv ow A pipe is greater than when in the air pipe.

A 'mod iiled form of seat for the valve 32 is shown in FigureA is which the valve seat 38 is provided with a single guide 39 for the valve stem .33 and is provided with external screw threads 40 for engagement with the internal screw threads of the valve casing 21.

In operation when'` pressure builds up in the cylinder II! it will force the piston I4, oil ow pipe I5, and plate, lI1 downward against the tension of the springs 2| until the trip disc 22 impingesagainst the valve stem 33. Thereupon the valve is opened and air under high pressure escapes into the cylinder III around the cil emerging from the oil ilow pipe I5 and lifts the latter in the well pipe I2.

For preventing reverse flow of oil and thus enabling the columns to build up and exert a downward pressure on the piston I4 a ball check valve 4I is mounted in a cage 42 which -is screw threadedly engaged with the top of the oil flow pipe as shown at 43. A l

From the above description it is thought that the construction and operation of the invention Will be fully understood without further explanation.

What is claimed is:

l. A iiuid lift pump comprising a,well pipe, a

tubular barrel forming .a closure in the pipe, a

2 4 I l a,14o,41`9 num pipe sudably med 1n the barrel, a piston carried by the iluid pipe and slidably tting the cylindrical wall of the barrel, a trip disc carried by the fluid pipe and movable as a unit with the uid pipe and piston. a compressed air supply pipe entering the barrel, a compressed air chamber in the barrel opening through the top of the barrel, a spring pressed valve controlling the chamber and having a stem projecting above the top'of the barrel tobe struck by said trip discto open the valve when pressure builds up in the uid pipe above the piston to depress the piston, and means connected to the well pipe and to the iluid pipe for limiting movement of the fluid pipe in either direction.

2. vA :luid lift 'pump comprising a casing threaded at the ends to receive a well pipe, a cylindrical barrel forming a closure in the casing, a piston mounted to slide in the barrel, a uid pipe forming a rod for the piston, a pair of plates arranged in the casing, one oi the plates being stationary and being connected to the casing and the other being movable, and being connected to the fluid pipe. springs yieldably holding the last 25 named plate against the barrel to prevent too high movement of the fluid pipe, a trip means carried by the fluid pipe. a compressed air chamber in the top of the barrel, and a valve controlling the compressed air chamber and adapted to be opened by downward movement of the trip disc to supply compressed air to the casing above the piston, and a check valve in the fluid pipe ypreventing retrograde movement. of the Iluid in the pipe.

3. A fluid lift pump comprising a well casing. a

cylindrical barrel in the casing, a fluid pipe movable longitudinally in the barrel, a piston carried by the iluid pipe and slidably tted in the barrel, a trip means on the uid pipe, a compressed air chamber in the barrel, a valve controlling the chamber and adapted to be opened by downward movement of the trip means to supply compressed air above the piston in the barrel. kan upper plate carried by and movable as a unit with the uid pipe, a lower plate carried by the casing and having guide openings, pins extending downward,

from the upper plate and slidably fitted in the guide openings, helical springs sleeved on the pins and bearing against both plates for normally holding the upper plate against the bottom of the barrel to limit upward movement of the fluid pipe, and a. check valve in the iluid pipe preventing retrograde movement of fluid in the nuid pipe. I

WILLIAM C. DOYLE. 

